Thanks for the quick and detailed reply. I fully understand your M.O. (method of operation) for testing lens.
However your tests do not work for me because I do not shoot film, I shoot at maximum aperture a lot and being an engineer, there is too much variation in your testing (test at different times and not testing multiple samples) to convince me. Nevertheless, if you are a film person shooting at F8 a lot, you should talk to snoweagle. I think we digital people have more problems at hand because we can shoot as many test shots as we want.
Anyway I think snoweagle is petty confident on his own results and I will say what i say again, take everything with a pinch of salt. Now that you set it very clear on your test M.O., everyone can look, comprehend or interpret your findings.